Random Bytes Generator
Uses window.crypto.getRandomValues — cryptographically secure, 100% client-side. Use the result for API keys, salts, IVs, and tokens.
Random Bytes Generator — Free Online Tool
Generates cryptographically secure random bytes using the Web Crypto API (crypto.getRandomValues), output as hex, base64, or base64url, with a selectable byte count (1–65536) — useful for generating API keys, salts, IVs, and initialization vectors for symmetric encryption.
How to use the Random Bytes Generator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the Random Bytes Generator free to use?
Yes. The Random Bytes Generator is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the Random Bytes Generator upload my data?
No. The Random Bytes Generator processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the Random Bytes Generator work offline?
After the page loads, the Random Bytes Generator runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this Random Bytes Generator
The Random Bytes Generator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.